Current Conditions

Arnold, Missouri

64°F18°C

Partly Cloudy

Wind

NE 6 mph10 km/h

Humidity

73%

Cloud Cover

64%

As of Wednesday, September 23, 2026 at 12:39 AM CDT

Today's Outlook

Day

Overcast and warm, with a high of 69°F21°C and morning low of 60°F15°C. Breezy from the NNE at 7 to 8 mph11 to 12 km/h.

Night

Mostly cloudy, with a low around 62°F17°C. Light wind from the NNE around 6 mph9 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Partly Cloudy	High 69°F21°C	Low 60°F15°C	Precip 0.01 in0.2 mm5%	Cloud 79%	Wind NNE 6 mph10 km/h	Wednesday: Overcast and warm, with a high of 69°F21°C and morning low of 60°F15°C. Breezy from the NNE at 7 to 8 mph11 to 12 km/h. Wednesday Night: Mostly cloudy, with a low around 62°F17°C. Light wind from the NNE around 6 mph9 km/h.
Cloudy	High 71°F22°C	Low 60°F15°C	Precip 0 in0 mm—	Cloud 83%	Wind NE 4 mph7 km/h	Thursday: Overcast and warm, with a high of 71°F22°C and morning low of 60°F15°C. Light wind from the NNE around 5 mph7 km/h. Thursday Night: Mostly cloudy, with a low around 61°F16°C. Light wind from the NE around 4 mph7 km/h.
Cloudy	High 76°F24°C	Low 62°F16°C	Precip 0.01 in0.2 mm6%	Cloud 88%	Wind ENE 4 mph6 km/h	Friday: Overcast and warm, with a high of 76°F24°C and morning low of 62°F16°C. Light wind from the ENE around 4 mph7 km/h. Friday Night: Overcast, with a low around 62°F17°C. Light wind from the ENE around 4 mph6 km/h.
Drizzle	High 72°F22°C	Low 62°F17°C	Precip 0.07 in1.9 mm34%	Cloud 85%	Wind E 4 mph7 km/h	Saturday: Overcast and warm, with a high of 72°F22°C and morning low of 62°F17°C. Light wind from the E around 4 mph7 km/h. 34% chance of drizzle throughout the day. Saturday Night: Mostly cloudy, with a low around 64°F18°C. Light wind from the E around 5 mph8 km/h. 34% chance of drizzle in the evening.
Drizzle	High 76°F24°C	Low 61°F16°C	Precip 0.06 in1.4 mm28%	Cloud 57%	Wind E 4 mph7 km/h	Sunday: Mostly cloudy and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the E around 4 mph6 km/h. 28% chance of drizzle throughout the day. Sunday Night: Mostly cloudy, with a low around 62°F16°C. Light wind from the ENE around 4 mph7 km/h. 20% chance of drizzle overnight.
Clear	High 80°F27°C	Low 58°F15°C	Precip 0.01 in0.2 mm6%	Cloud 31%	Wind ENE 4 mph6 km/h	Monday: Partly cloudy and warm, with a high of 80°F27°C and morning low of 58°F15°C. Light wind from the E around 3 mph6 km/h. Monday Night: Partly cloudy, with a low around 60°F16°C. Light wind from the ENE around 5 mph7 km/h.
Light Rain	High 79°F26°C	Low 59°F15°C	Precip 0.17 in4.2 mm32%	Cloud 73%	Wind SSE 7 mph11 km/h	Tuesday: Mostly cloudy and warm, with a high of 79°F26°C and morning low of 59°F15°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. 26% chance of light rain throughout the day. Tuesday Night: Mostly cloudy, with a low around 60°F16°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. 32% chance of light rain in the evening.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 23	69°F21°C	60°F15°C	0.01 in0.2 mm· 5%	79%	Partly Cloudy	NNE 6 mph10 km/h
DayOvercast and warm, with a high of 69°F21°C and morning low of 60°F15°C. Breezy from the NNE at 7 to 8 mph11 to 12 km/h. NightMostly cloudy, with a low around 62°F17°C. Light wind from the NNE around 6 mph9 km/h.
	ThursdaySep 24	71°F22°C	60°F15°C	0 in0 mm· —	83%	Cloudy	NE 4 mph7 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 60°F15°C. Light wind from the NNE around 5 mph7 km/h. NightMostly cloudy, with a low around 61°F16°C. Light wind from the NE around 4 mph7 km/h.
	FridaySep 25	76°F24°C	62°F16°C	0.01 in0.2 mm· 6%	88%	Cloudy	ENE 4 mph6 km/h
DayOvercast and warm, with a high of 76°F24°C and morning low of 62°F16°C. Light wind from the ENE around 4 mph7 km/h. NightOvercast, with a low around 62°F17°C. Light wind from the ENE around 4 mph6 km/h.
	SaturdaySep 26	72°F22°C	62°F17°C	0.07 in1.9 mm· 34%	85%	Drizzle	E 4 mph7 km/h
DayOvercast and warm, with a high of 72°F22°C and morning low of 62°F17°C. Light wind from the E around 4 mph7 km/h. 34% chance of drizzle throughout the day. NightMostly cloudy, with a low around 64°F18°C. Light wind from the E around 5 mph8 km/h. 34% chance of drizzle in the evening.
	SundaySep 27	76°F24°C	61°F16°C	0.06 in1.4 mm· 28%	57%	Drizzle	E 4 mph7 km/h
DayMostly cloudy and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the E around 4 mph6 km/h. 28% chance of drizzle throughout the day. NightMostly cloudy, with a low around 62°F16°C. Light wind from the ENE around 4 mph7 km/h. 20% chance of drizzle overnight.
	MondaySep 28	80°F27°C	58°F15°C	0.01 in0.2 mm· 6%	31%	Clear	ENE 4 mph6 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 58°F15°C. Light wind from the E around 3 mph6 km/h. NightPartly cloudy, with a low around 60°F16°C. Light wind from the ENE around 5 mph7 km/h.
	TuesdaySep 29	79°F26°C	59°F15°C	0.17 in4.2 mm· 32%	73%	Light Rain	SSE 7 mph11 km/h
DayMostly cloudy and warm, with a high of 79°F26°C and morning low of 59°F15°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. 26% chance of light rain throughout the day. NightMostly cloudy, with a low around 60°F16°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. 32% chance of light rain in the evening.
	WednesdaySep 30	74°F23°C	65°F18°C	0.46 in11.7 mm· 48%	77%	Light Rain	SW 8 mph12 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 65°F18°C. Breezy from the WSW at 8 to 9 mph13 to 14 km/h. 48% chance of light rain throughout the day. NightMostly cloudy, with a low around 65°F18°C. Breezy from the SW at 7 to 8 mph12 to 13 km/h. 45% chance of light rain throughout the night.
	ThursdayOct 1	75°F24°C	59°F15°C	0.23 in5.9 mm· 26%	54%	Showers	WNW 7 mph12 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 59°F15°C. Breezy from the WNW at 8 to 9 mph13 to 14 km/h. 26% chance of showers throughout the day. NightMostly cloudy, with a low around 61°F16°C. Breezy from the W at 7 mph11 km/h. 26% chance of showers throughout the night.
	FridayOct 2	76°F24°C	57°F14°C	0.17 in4.2 mm· 18%	46%	Showers	SSW 6 mph10 km/h
DayPartly cloudy and warm, with a high of 76°F24°C and morning low of 57°F14°C. Breezy from the SW at 7 mph11 km/h. 18% chance of showers throughout the day. NightPartly cloudy, with a low around 59°F15°C. Breezy from the S at 6 to 7 mph10 to 11 km/h. 18% chance of showers throughout the night.
	SaturdayOct 3	76°F25°C	59°F15°C	0.09 in2.3 mm· 16%	54%	Drizzle	SSW 7 mph12 km/h
DayMostly cloudy and warm, with a high of 76°F25°C and morning low of 59°F15°C. Breezy from the SSW at 8 mph12 km/h. 16% chance of drizzle throughout the day. NightMostly cloudy, with a low around 61°F16°C. Breezy from the SSW at 7 to 8 mph11 to 12 km/h. 13% chance of drizzle throughout the night.
	SundayOct 4	73°F23°C	57°F14°C	0.1 in2.5 mm· 15%	51%	Drizzle	W 7 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 57°F14°C. Breezy from the WNW at 8 to 9 mph13 to 14 km/h. 15% chance of drizzle throughout the day. NightPartly cloudy, with a low around 60°F15°C. Breezy from the W at 7 mph11 km/h. 15% chance of drizzle throughout the night.
	MondayOct 5	71°F22°C	54°F12°C	0.1 in2.6 mm· 14%	45%	Showers	WNW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 71°F22°C and morning low of 54°F12°C. Breezy from the WNW at 7 to 8 mph11 to 12 km/h. 13% chance of drizzle throughout the day. Dry air. NightPartly cloudy, with a low around 56°F13°C. Breezy from the WNW at 6 to 7 mph10 to 11 km/h. 14% chance of showers throughout the night.
	TuesdayOct 6	70°F21°C	53°F11°C	0.12 in3.1 mm· 14%	42%	Showers	WNW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 70°F21°C and morning low of 53°F11°C. Breezy from the WNW at 7 to 8 mph11 to 12 km/h. 14% chance of showers throughout the day. Dry air. NightPartly cloudy, with a low around 55°F13°C. Breezy from the WNW at 7 mph11 km/h. 10% chance of showers throughout the night.
	WednesdayOct 7	70°F21°C	51°F10°C	0.06 in1.5 mm· 9%	31%	Clear	NW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 70°F21°C and morning low of 51°F10°C. Breezy from the NW at 7 to 8 mph12 to 13 km/h. Dry air. NightPartly cloudy, with a low around 53°F12°C. Breezy from the NW at 7 mph11 km/h.

Nearby Cities

Oakville5 mi8 km Mehlville6 mi10 km Concord6 mi10 km Affton8 mi14 km Lemay9 mi14 km Kirkwood11 mi17 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 38.4328°N, 90.3776°W·Elevation: 184m·Timezone: America/Chicago·Population: 21,357